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System.InvalidOperationException The Microsoft.AspNet.Mvc.SessionStateTempDataProvider' cannot serialize an object of type 'ModelStateDictionary' to session state.

新增一個 extension method

public static class TempDataExtensions
{
    public static void Put<T>(this ITempDataDictionary tempData, string key, T value) where T : class
    {
        tempData[key] = JsonConvert.SerializeObject(value);
    }

    public static T Get<T>(this ITempDataDictionary tempData, string key) where T : class
    {
        object o;
        tempData.TryGetValue(key, out o);
        return o == null ? null : JsonConvert.DeserializeObject<T>((string)o);
    }
}

傳值 & 取值

TempData.Put("key", objectA);
var value = TempData.Get<ClassA>("key")